Store Lease Exit Costs and Impairment Charges (Store Lease Exit Cost Activity) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 03, 2015		Dec. 28, 2013		Dec. 29, 2012		Dec. 31, 2011
Store Lease Exit Costs [Roll Forward]
Beginning balance							$ 77.0
Ending balance	129.2		181.0		76.5		77.0
Dominick's Stores [Member]
Store Lease Exit Costs [Roll Forward]
Provision for estimated net future cash flows of closed stores	0	[1]	113.6	[1]	0	[1]
Net cash flows, interest accretion, changes in estimates of net future cash flows (3)	(15.9)	[2]	0	[2]	0	[2]
Other Stores [Member]
Store Lease Exit Costs [Roll Forward]
Provision for estimated net future cash flows of closed stores	1.2	[3]	6.1	[3]	19.4	[3]
Net cash flows, interest accretion, changes in estimates of net future cash flows (3)	$ (37.1)	[4]	$ (15.2)	[4]	$ (19.9)	[4]

[1] Estimated net future cash flows for Dominick's stores closed during the fourth quarter of 2013.

[2] Net cash flows, interest accretion, changes in estimates of net future cash flows for Dominick's stores disposed of in 2014.

[3] Estimated net future cash flows represents future minimum lease payments and related ancillary costs from the date of closure to the end of the remaining lease term, net of estimated cost recoveries that may be achieved through subletting properties or through favorable lease terminations.

[4] Net cash flows, interest accretion, changes in estimates of net future cash flows for all stores other than Dominick's stores disposed of in 2014.